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A158784
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Expansion of (1+4*x+14*x^2)/(1-2*x^2-64*x^3).
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0
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1, 4, 16, 72, 288, 1168, 5184, 20768, 85120, 373312, 1499392, 6194304, 26890752, 108349696, 450216960, 1937707520, 7834814464, 32689300480, 139682910208, 566806726656, 2371481051136, 10073319706624, 41018592608256
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OFFSET
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0,2
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COMMENTS
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Can be generated by multiplying the sum of the top row of the n-th power of the matrix [ (0,2,0), (0,0,2), (2,1/4,0)] by 2^n.
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LINKS
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FORMULA
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a(n)= 2*a(n-2) +64*a(n-3). [From R. J. Mathar, Mar 31 2009]
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MATHEMATICA
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Clear[M, v, t, n];
M = {{0, t, 0}, {0, 0, t}, {t, 1/t^2, 0}};
v[0] = {1, 1, 1};
v[n_] := v[n] = M.v[n - 1];
CharacteristicPolynomial[M, x];
t = 2;
a = Table[t^n*v[n][[1]], {n, 0, 30}]
LinearRecurrence[{0, 2, 64}, {1, 4, 16}, 30] (* Harvey P. Dale, Apr 05 2019 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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